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CLI
passwords
conf term enable secret 0 <pass> ! for telnet: line vty 0 4 login password <pass> end wr copy run start
STARTUP_CONFIG_IGNORED
%SYS-6-STARTUP_CONFIG_IGNORED: System startup configuration is ignored based on the configuration register setting.
sh version ... Configuration register is 0x141
enable dir conf term boot system flash bootflash:cat4500-ipbasek9-mz.122-54.SG1.bin exit wr copy run star config-register 0x102 reload
Console baud rate
It is possible to switch console baud rate after boot. It will be applied after system will bootup and executes startup-config.
configure terminal line con 0 speed 9600 ! note: now you need to reconfigure your terminal client to different baud rate end wr copy run star
LLDP
enable config terminal lldp run exit copy run start show lldp neighbors
PoE
show power inline
Enable SNMP
enable configure terminal snmp-server community public ro snmp-server contact <itadmin@grinn-global.com> snmp-server location GRINN - Serwerownia exit copy run start
VLAN
enable show vlan configure terminal ! delete vlan 7 no vlan 7 ! add tagged vlan 28 vlan 28 name admin end show vlan configure terminal interface range Gi0/1-28 switchport trunk encapsulation dot1q switchport trunk native vlan 1 switchport trunk allowed vlan add 28,255 no shut end
configure terminal interface range Gi0/1-28 ! to remove all ports from VLAN: no switchport access vlan end
VLAN IP address
enable configure terminal interface vlan 1 no ip address DHCP no ip address end int vlan 28 ip address 192.168.28.31 255.255.252.0 no shutdown exit ip default-gateway 192.168.28.1 ip name-server 192.168.28.1 ntp server 192.168.28.1 end show ip redirects show spanning-tree vlan 28 sh int vlan 28 copy running-config startup-config
wr copy running-config startup-config
put one port in VLAN
conf term interface Gi1/48 switchport access vlan 28 end wr
reload
reload
RSTP
show spanning-tree summary enable config spanning-tree mode ? spanning-tree mode rapid-pvst spanning-tree vlan 1 priority 57344 spanning-tree vlan 2 priority 57344 spanning-tree vlan 28 priority 57344 spanning-tree vlan 255 priority 57344 exit show spanning-tree bridge wr copy run star
Disable STP:
enable config terminal Switch(config)#no spanning-tree vlan 1 wr copy run star
Find MAC on ports
sh mac address-table vlan 1
show interface Gi0/40 show controllers
show port counters
show interface counters enable clear counters
diagnose port
show interface Gi0/17
Using Time Domain Reflectometer
enable test cable-diagnostics tdr int Gi0/17 show cable-diagnostics tdr int Gi0/17